#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void MallocMem(char** pc) {
	*pc = (char *) malloc(100);
	return ;
}

int main() {
  char * str =NULL;
  MallocMem(&str);
  strcpy(str,"hello ");
  strcat(str,"world!");
  printf("%s\n",str);
  return 0;
}
